Police investigating the July 7 bombings on London's transit system made searches Friday at properties in Leeds, the city in northern England where three of the suicide bombers lived.
Scotland Yard police headquarters in London said anti-terrorist officers were searching a combination of residential and business premises, together with local officers from West Yorkshire Police.
"Searches remain ongoing. No arrests have been made," a statement from the London force said. "This is in connection with the terrorist attack in London on July 7."
The force said the searches began late Tuesday night, according to the AP.
Hasib Hussain, 18, from the Holbeck neighborhood of Leeds, blew himself up in a double-decker bus at Tavistock Square in London. Shahzad Tanweer, 22, from the city's Beeston area, died in a blast on a subway train near Aldgate station and Mohammad Sidique Khan, 30, who lived in nearby Dewsbury but had worked at a Beeston primary school, blew up a bomb at the Edgware Road subway station.
Fifty-two commuters were killed in the attacks.
A solitary police officer stood guard outside the two neighboring shops which were being searched in Beeston _ a computer store and hat shop. Neighbors said the stores are owned and run by a Pakistani man and his wife who live together in an apartment above and have not been seen since Tuesday.
The stores are only a few hundred meters (yards) from the house where Tanweer lived.
On photo: cuicide bomber Hasib Hussain.